Improvement in middlings-purifiers



3 Sheet-s--Sheet 1., I. SCHOLFIELD.

Middlings-Puriers. No, 145,906, Patented Dec.23,1873.

SSheetsu'SheetZ. l. scHuLrlELu Middlings-Puringlrs.

N0. 145,906, Patented Dec.23,1873.

- 3Sheets-Sheet3.

I. SCHULFIELD.

Middlings-Purifers.

N0. 145,906, Patented Dec. 23,1873.

UNITED STATES PATENT OFFICEo ISSAOHAR SOHOLFIELD, OF DUNLAP, ASSIGNOR OFONEHALF HIS RIGHT TO BENJAMIN F. FREDRICK, OF MARSHALL COUNTY, IOIVA.

IMPROVEMENT IN MIDDLINGS-PURIFIERS.

Specification forming part of Letters Patent No. l45,906,`dated December23,1873 application filed August 16, 1873.

To all whom fit may concern:

Be it known that I, IssAoHAR ScrroLrrnLn, of Dunlap, in the county ofHarrison and State of Iowa, have invented certain new and usefulImprovements in Middlings-Puriers; and I do hereby declare the followingto be a full, clear, and exact description thereof, reference being hadto the accompanying drawings and to the letters of reference markedthereon.

My invention relates to that class of machines used for purifyingmiddlings; and it consists in the con struction and novel arrangement ofparts, as will be hereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same,I will now proceed to describe itsconstruction and operation, referring to the annexed drawings which forma part of this specification, and in which- Figure lis a longitudinalvertical section,

Fig. 2 a side elevation, and Fig. 3 a plan view,

of my machine.

A represents the frame, which is constructed in any suitable manner tocontain the various working parts of my machine. B represents thehopper, in the bottom of which is a longitudinally-tinted or corrugatedrevolving roller, C. Attached to the hopper B is a feed-board, D,adjusted by means of setscrews a, to regulate the feed.

H H, and containing or carrying a gang of sieves, G G. This frame'E,with its sieves, is vibrated back and forth by means of a pitman, I, oneend of which is attached to a crank-shaft, J and the other end to acrossbar in the top of the frame. At each backward motion the frame Estrikes a bumper, b, formed of a set-screw, which may be adjusted so asto make the blow great or small, as desired. At suitable points throughthe sieves G G pass bolts d. These bolts pass through pieces of leathere c glued to each side of each sieve, and through blocks ff, placedbetween the sieves, and are firmly secured by burs on the lower endsunder the sieves. 'On the head of each bolt d strikes a hammer, K, whichis pivoted at X, as shown E representsva frame or shoe supported uponsteel springs strike projections on the rear ends of the hammers,raising their front ends up, and, as soon as the pins have cleared saidprojections, the hammers fall down on the heads of the bolts d d. m is asetscrew attached to the side of the frame E, and passing through thetail-board a to raise and lower the sieves at will. Under thesieve-frame E is a hoppershaped receptacle, M, with a conductor, O, atthe bottom. Immediately back of this and under the tail-board n is apassage, N, with a conductor, O1, at the bottom. At the back end of themachine is a chimney, P, with conductor O2 at the bottom. The conductorO1 connects with an elevator, It, at the side of the machine, and at thetop of this elevator is a spout, p, leading into the hopper B. Thechimney P is for the purpose of carrying off dust, &c. At the front partof the machine is the fan-case S, containing the fan T, and the air isforced by said fan through an upwardly-inclined passage, V, to and underthe sieves. At each end of the fan caseor drum S isa slide', s, toregulate the draft.

The operation of the machine is as follows: The middlings are fed intothe hopper B and carried over by the uted roller C, falling onto thegang of sieves G, the pure middlings passing through the sieves into theconveyer O. The impurities are carried over and off the tail-board n andfall into the conveyer O2, while the returns, or that part of themiddlings that may pass over the sieve under the tail-board, fallthrough the passage N into the conveyer O1, and are returned by theelevator R into the hopper to be cleaned over.

The separation is effected in the following manner: The pressure of airby the fan T, under and through the gang of sieves G,holds up and forcesback the light and impure particles from passing through, and which arecarried off over the tail-board a, while the pure middlings, beingheavier, pass through the sieves into the conveyer O. The separation isalso assisted by the vibration of the sieves by the pitmen I, by thehammers K In j striking the hea 's of the bolts d in the sievecioth,(freeing the cloth from any particles that may adhere to it and preventthem from cloggingg) also by the bumper d, which causes a sudden jar tothe sieves 011 their backward motion, thus most perfectly separating`and carrying oft' all the impurities.

The Various parts of this machine are revolved by means of belts andpulle5 s, arran gc d in any suitable manner.

I claim-'- l. The combinatiomwith the sieves G and hammers K, operatedas described, of the fan T, receptacle M, passage N, and chimney P, withtheir respective conductors O O1 O2, the

elevator R, and spout I), arranged in a relative'position to each other,substantially as shown and described.

2. In a middlingspurier, sieves G, having,` pieces of leather e glued toeach side of each sieve-cloth, and blocks f placed between said leatherand sieves and firmly secured bymeans of bolts Z passing through saidparts, in combination With hammers K, as and for the purpose mentioned.

ISSACHAR SGHOLFIELD.

Vitnesses G. N. THOMPSON, E. G. PERKINs.

